如何用linq做一個LIKE查詢？

Question

如何在Linq中執行LIKE查詢？

我有以下查詢我想要執行。

var results = from c in db.costumers 
       where c.FullName LIKE "%"+FirstName+"%,"+LastName 
       select c; 

Answer 1

你可以使用SqlMethods.Like(matchExpression,pattern)

var results = from c in db.costumers 
       where SqlMethods.Like(c.FullName, "%"+FirstName+"%,"+LastName) 
       select c; 

使用這種方法的LINQ以外的SQL總會拋出NotSupportedException異常。

Answer 2

嘗試使用string.Contains（）與EndsWith組合。

var results = from c in db.Customers 
       where c.FullName.Contains (FirstName) && c.FullName.EndsWith (LastName) 
       select c; 

Answer 3

where c.FullName.Contains("string") 

Answer 4

您可以使用包含：

string[] example = { "sample1", "sample2" }; 
var result = (from c in example where c.Contains("2") select c); 
// returns only sample2 

Answer 5

嘗試這樣

var results = db.costumers.Where(X=>X.FullName.Contains(FirstName)&&(X=>X.FullName.EndsWith(LastName)) 
          .Select(X=>X); 

Answer 6

String [] obj = (from c in db.Contacts 
          where c.FirstName.StartsWith(prefixText) 
          select c.FirstName).ToArray(); 
      return obj; 

StartsWith（）和的endsWith（）可以幫助你在這裏有很多。如果你想在字段間找到數據，那麼可以使用Contains（）。

Answer 7

var StudentList = dbContext.Students.SqlQuery("Select * from Students where Email like '%gmail%'").ToList<Student>();

用戶可以在LINQ的使用類似的查詢，並填寫學生模型。